Fitness and the level of homozygosity in a social insect

@article{HaagLiautard2009FitnessAT,
  title={Fitness and the level of homozygosity in a social insect},
  author={Cathy Haag-Liautard and Emma I. K. Vitikainen and Laurent Keller and L Sundstr{\"o}m},
  journal={Journal of Evolutionary Biology},
  year={2009},
  volume={22}
}
To date very few studies have addressed the effects of inbreeding in social Hymenoptera, perhaps because the costs of inbreeding are generally considered marginal owing to male haploidy whereby recessive deleterious alleles are strongly exposed to selection in males. Here, we present one of the first studies on the effects of queen and worker homozygosity on colony performance. In a wild population of the ant Formica exsecta, the relative investment of single‐queen colonies in sexual production… Expand
No inbreeding depression but increased sexual investment in highly inbred ant colonies
TLDR
The absence of inbreeding depression combined with increased reproductive investment, especially in outbreeding sexuals, suggests that these ants have evolved active strategies to regulate the extent and effects of frequent inbreeding. Expand
INBREEDING AND REPRODUCTIVE INVESTMENT IN THE ANT FORMICA EXSECTA
TLDR
It is suggested that the effects of worker inbreeding on colony productivity and investment in the ant Formica exsecta represents a new kind of social inbreeding depression that may affect sex ratios as well as caste fate in social insects. Expand
Female Choice in Social Insects
TLDR
This chapter provides a theoretical introduction to female choice in social insects, arguing that in the absence of female remating later in life and exceptional high demands for large numbers of viable sperm, queens should express male choice throughout all steps of the mating process. Expand
Natal Dispersal, Mating Patterns, and Inbreeding in the Ant Formica exsecta
TLDR
The results showed that the population was inbred and that inbreeding avoidance behaviors—sex-biased dispersal, queen dispersal distance, and multiple mating—were all ineffective in reducing homozygosity among colony workers. Expand
No benefit in diversity? The effect of genetic variation on survival and disease resistance in a polygynous social insect
TLDR
Increasing the genetic diversity of pharaoh ant colonies may not provide survival advantages in the face of pathogen exposure, and polygyny and polyandry may not be directly comparable mechanisms for creating adaptive resistance towards pathogens. Expand
Inbreeding and caste-specific variation in immune defence in the ant Formica exsecta
TLDR
The results show that the regulation of the expression of immunity differs between female castes despite their similar genetic make-up, and this may reflect genetic stress caused by inbreeding, which in turn may compromise colony founding and longevity. Expand
Meiotic recombination dramatically decreased in thelytokous queens of the little fire ant and their sexually produced workers.
TLDR
It is suggested that the combination of automixis with central fusion and a major decrease in recombination rates allows clonal queens to benefit from thelytoky while avoiding the potential inbreeding depression resulting from the loss of heterozygosity during Automixis. Expand
Sib‐mating in the ant Plagiolepis pygmaea: adaptative inbreeding?
TLDR
The data show that workers actively repel unrelated males entering their colony, and that queens preferentially mate with related males, consistent with inclusive fitness being a driving force for inbreeding: by preventing outbreeding, workers reduce erosion of relatedness within colonies due to polygyny and polyandry. Expand
Colony kin structure and breeding system in the ant genus Plagiolepis
TLDR
Both the occurrence of multiple queens (polygyny) and multiple mating (polyandry) decrease within‐colony relatedness, while mating among sibs increases relatedness between the workers and the brood they rear. Expand
Macro‐ and microgeographic genetic structure in an ant species with alternative reproductive tactics in sexuals
The genetic structure of social insect populations is influenced by their social organization and dispersal modes. The ant Hypoponera opacior shows diverse reproductive behaviours with regular cyclesExpand
...
1
2
3
4
5
...

References

SHOWING 1-10 OF 53 REFERENCES
Diploid males and colony-level selection in Formica ants
TLDR
Models of the load hypothesis suggest that slow growth and high mortality of colonies with diploid males favour single mating by queens, and the longer the period of slow colony growth and the heavier the mortality, the stronger is the selection for monandry. Expand
Sex determination and the evolution of polyandry in honey bees (Apis mellifera)
TLDR
The sex locus hypothesis for the evolution of polyandry in honey bees (Apis mellifera) was tested, finding significant relationships between brood viability and most colony measures during the growth phase of colonies, but the data were too variable to distinguish significant non-linear effects. Expand
Habitat age, breeding system and kinship in the ant Formica fusca
TLDR
The results showed that both the mating system and colony kin structure differed between the study populations, and the number of queens per colony appeared more stable between years, although queen turnover occurred also in this population. Expand
Effect of a founder event on variation in the genetic sex-determining system of the fire ant Solenopsis invicta.
TLDR
It is concluded that diploid males have increased in frequency in introduced populations because of a loss of allelic diversity at the sex-determining locus (loci) of S. invicta, which has generated a substantial increase in the estimated segregational genetic load associated with production of sterile diploids males in introducing populations over the load in native populations. Expand
Inbreeding depression and family variation in a social insect, Bombus terrestris (Hymenoptera: Apidae)
TLDR
Large among-family variation appears to be a key feature that characterizes all main steps in the life cycle of B. terrestris and intensifies the differential representation of families in the population. Expand
Sex Allocation and Colony Maintenance in Monogyne and Polygyne Colonies of Formica truncorum (Hymenoptera: Formicidae): The Impact of Kinship and Mating Structure
TLDR
The results suggest that workers control reproductive allocation, and monogyne colonies with a high total production relative to colony size invested excess resources in reproduction, whereas the reproductive allocation did not change with increased productivity in polygyne colonies. Expand
Estimation of allele numbers at the sex-determining locus in a field population of the turnip sawfly (Athalia rosae).
TLDR
It is suggested that the effective population size may be much larger than that from the areas where the authors collected larvae, and that there are mechanisms for avoiding inbreeding, including protogyny, dispersion, and sperm displacement by second-mated males. Expand
Temporal and spatial variations of gyne production in the ant Formica exsecta
TLDR
The finding that gyne production varies greatly between years suggests that it may not always be adaptive at a local scale, perhaps because of stochastic variations in environmental factors. Expand
Diploid male production — a significant colony mortality factor in the fire ant Solenopsis invicta (Hymenoptera: Formicidae)
TLDR
The results suggest that the observed distribution of male diploidsy in S. invicta can be explained by differential mortality of diploid male producing colonies of the two forms, with such colonies ofThe monogyne form experiencing 100% mortality early in development. Expand
Population structure, mating system, and sex-determining allele diversity of the parasitoid wasp Habrobracon hebetor
TLDR
Genetic analyses of an H. hebetor population in Wisconsin showed that inbreeding avoidance always decreased CSD loads, but multiple mating only reduced loads in populations with fewer than five sex-determining alleles, and determined that the mating system is effectively monogamous. Expand
...
1
2
3
4
5
...